Details here: Grit Guard, Grit Guard insert, bucket grate, bucket grid,
I think 1.8 will have better fuel efficiency and power as it's latest Toyota engine and transmission. Even in manual there are six gears. Altis 1.8 Cvti is totally a new car, engine and transmission, except alloys 
Which process?
It should do at least 11 with full ac and stop-go-stop traffic. It gives better milage at high speed and smooth journeys I got max 13, but these days again rush and ac and getting 11.6 to 11.8, in this heat lot of idling and ac, even when waiting for the family to return from shopping.